I have decided not to do something with ice sampling- too hard, and too many variables. Instead I have decided to do an experiment with propellers. Does anyone know a good website with strong background info on propellers, that is somewhat dummy proof?

 

Thanks!!!!

google.com

 

seems like the only real variable you care to avoid is the "effort" variable.

If you look up info on recreational boating (specifically the props used), that will give you a very rudimentary start, that is quite dummy proof.

Thank you dirty America. I am not entirely certain why you think I wish to avoid the "effort" variable. I spent several hours working on this yesterday. The reason I decided not to do this project is because there is no way to measure the force with which to use the scrapers. Therefore, it would be difficult to convince the judges that this project is a scientific project, with so large of a variable. Please think first.

Thank you also big314mp. Your suggestion did help a lot

Edited November 16, 200817 yr by dance4life51

I don't know anything about propellers beyond the basic concepts, but I'm curious: what experiment do you have in mind?

I'm not quite sure how much you now about propellers, but if you are familiar with the chord of a propeller, I am working to see if varying chord lengths in propellers effect the efficiency of the propellers, and if so, how?

Thank you dirty America. I am not entirely certain why you think I wish to avoid the "effort" variable. Please think first.

 

You're quite welcome. Thanks for the kudos.

 

First, you got on here and asked about ice stuff ( http://www.scienceforums.net/forum/showthread.php?t=36443 ). Then you gave up after a few hours. Next, you started this thread about a new project about propellers. You came on here and made no reference whatsoever to any work you've done so far regarding propellers. You even asked for dummy-proof info on propellers suggesting that you have done zero research as of yet.

 

Get it???

 

When it comes to me vs. you, I'd say that I have thought first.

 

I do wish you well on your project.

I will humor you. If I see any good stuff on propellers I'll post links here.

 

Peace,

DA

Edited November 17, 200817 yr by dirtyamerica

If you want to include any calculations into your project, you might want to take a look at fluid dynamics. (Chance is that you'll soon realize that the ice project was easier).

 

Here's some wikipedia links to relevant parameters. I'm not saying you should fill in all the formula's you'll find on those webpages. If you're new to the topics, then I think you do a good job if you just understand the concepts.

 

http://en.wikipedia.org/wiki/Fluid_mechanics

 

In fluid dynamics, the use of "dimensionless numbers" is quite common. These seem relevant for propellers. A commonly used dimensionless number is the Reynolds number.

http://en.wikipedia.org/wiki/Reynolds_number

And perhaps the power number is also relevant.

http://en.wikipedia.org/wiki/Power_number